nate silver said:A CBS News poll of undecided voters who watched the debate found 53 percent giving it to Mr. Obama, 23 percent to Mitt Romney and 24 percent declaring it a tie. Mr. Obama’s margin of victory in the poll was slightly wider than Mr. Romney’s following the first presidential debate in Denver, which a similar CBS News poll gave to Mr. Romney at 46 percent to 22 percent.
Here's Silver's article since I'm just regurgitating it anyway: http://fivethirtyeight.blogs.nytime...g-debate-bounce-but-a-small-one-could-matter/